# Imagick::randomThresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::randomThresholdImage — Creates a high-contrast, two-color image

### Beschreibung

public Imagick::randomThresholdImage(float `$low`, float `$high`, int `$channel` = Imagick::CHANNEL_DEFAULT): bool

Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image. Diese Funktion ist verfügbar, wenn Imagick gegen die ImageMagick-Version 6.2.9 oder höher kompiliert wurde.

### Parameter-Liste

`low`

  The low point

`high`

  The high point

`channel`

  Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.

### Rückgabewerte

Liefert `true` bei Erfolg.

### Beispiele

Beispiel #1 Imagick::randomThresholdImage()

`<?php
function randomThresholdimage($imagePath, $lowThreshold, $highThreshold, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->randomThresholdimage(
$lowThreshold * \Imagick::getQuantum(),
$highThreshold * \Imagick::getQuantum(),
$channel
);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>`
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